... overcome the deficiencies of existing technologies. The Joint of the utility model, including a chimeric structure ... , and left and right sets of the inner cavity are consistent with the helical screw alveolus ... left and right sets of surface contact between pin and hole positioning. Resolved by plate-based ... gear, 5, lift plate, 6, helical gear, 7 pin, 8, positioning holes, 9, plywood, 10 journal sets, ...